The glory of God in Scripture is the manifest weight, splendor, and radiant presence of God himself, revealed in creation, dwelling in the tabernacle and temple, and fully disclosed in the face of Jesus Christ.
The Hebrew word kabod, often translated 'glory,' means weight or heaviness before it means splendor. The glory of God is the presence of God himself in his full reality: his moral beauty, his sovereign majesty, his consuming holiness. In the OT the glory fills the tabernacle and the temple as a visible, luminous cloud that signals God's dwelling with his people.
When it departs in Ezekiel 10-11, it is a covenant rupture of catastrophic proportions. When it returns in Ezekiel 43, it announces restoration. In the NT the glory motif reaches its fullest expression in the incarnation: the Word became flesh and dwelt among us, and we have seen his glory (John 1:14). Jesus is the temple rebuilt, the place where God's presence dwells in a body.
His transfiguration, resurrection, and ascension are the progressive revelation of a glory that was there from the beginning. The canon closes with the New Jerusalem needing no sun or lamp, for the glory of God gives it light and its lamp is the Lamb (Revelation 21:23).